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Deferred Acquisition Costs and Other Actuarial Balances - Unearned Revenue Liability Balances and Changes (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Other Actuarial Balances |  |
Beginning balance, Unearned Revenue Liability | $ 492.7 |
Ending balance, Unearned Revenue Liability | 515.4 | $ 492.7
Universal life | Benefits and Protection | Life Insurance |  |
Other Actuarial Balances |  |
Beginning balance, Unearned Revenue Liability | 485.5 | 459.0
Deferrals | 56.1 | 56.3
Revenue recognized | (31.5) | (29.8)
Ending balance, Unearned Revenue Liability | 510.1 | 485.5
Reinsurance impact | (220.8) | (225.1)
Balance at end of period after reinsurance | $ 289.3 | $ 260.4

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